Chemistry students must be able to use Le Chatelier's Principle on equilbria and can usually successfully make predictions with it without understanding why it works. By setting up an equilibrium with varying concentrations and using the kinetic energy distribution to explain temperature effects, thePrinciple becomes more understandable. Effects of volume changes, surface areas, solids, catalysts, Keq and liquids are illustrated. Students can then apply the Principle in various situations. A 12